Use fake Input Device Settings with chrome://device-emulator

chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h

Index: chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h b/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h
index 0af60a94ed3439a657eaafb3bab3cf3503b69062..e3853bc0bbda27e372503cf9cb03bd3fadfa7bbd 100644
--- a/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h
+++ b/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h
@@ -8,6 +8,8 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/chromeos/system/pointer_device_observer.h"
 #include "chromeos/dbus/power_manager/power_supply_properties.pb.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
@@ -28,9 +30,14 @@ namespace chromeos {
 class FakeCrasAudioClient;
 class FakePowerManagerClient;
 
+namespace system {
+class FakeInputDeviceSettings;
+}
+
 // Handler class for the Device Emulator page operations.
 class DeviceEmulatorMessageHandler
-    : public content::WebUIMessageHandler {
+    : public content::WebUIMessageHandler,
+      public system::PointerDeviceObserver::Observer {
  public:
   DeviceEmulatorMessageHandler();
   ~DeviceEmulatorMessageHandler() override;
@@ -72,6 +79,12 @@ class DeviceEmulatorMessageHandler
   // based on the node id.
   void HandleRemoveAudioNode(const base::ListValue* args);
 
+  // Connects or disconnects a fake mouse.
+  void HandleSetHasMouse(const base::ListValue* args);
+
+  // Connects or disconnects a fake touchpad.
+  void HandleSetHasTouchpad(const base::ListValue* args);
+
   // Callbacks for JS update methods. All these methods work
   // asynchronously.
   void UpdateBatteryPercent(const base::ListValue* args);
@@ -108,6 +121,15 @@ class DeviceEmulatorMessageHandler
   std::unique_ptr<base::DictionaryValue> GetDeviceInfo(
       const dbus::ObjectPath& object_path);
 
+  // Ensures the fake_input_device_settings_ pointer is valid (equal to the
+  // global InputDeviceSettings instance) or creates a new one. Returns a valid
+  // FakeInputDeviceSettings.
+  system::FakeInputDeviceSettings* CreateFakeInputDeviceSettingsIfNecessary();
+
+  // system::PointerDeviceObserver::Observer:
+  void TouchpadExists(bool exists) override;
+  void MouseExists(bool exists) override;
+
   bluez::FakeBluetoothDeviceClient* fake_bluetooth_device_client_;
   std::unique_ptr<BluetoothObserver> bluetooth_observer_;
 
@@ -117,6 +139,10 @@ class DeviceEmulatorMessageHandler
   FakePowerManagerClient* fake_power_manager_client_;
   std::unique_ptr<PowerObserver> power_observer_;
 
+  system::FakeInputDeviceSettings* fake_input_device_settings_;
+
+  base::WeakPtrFactory<DeviceEmulatorMessageHandler> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(DeviceEmulatorMessageHandler);
 };